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A Simple Thermodynamical Witness Showing Universality of Macroscopic Entanglement

Abstract:
We show that if the ground state entanglement exceeds the total entropy of a given system, then this system is in an entangled state. This is a universal entanglement witness that applies to any physical system and yields a temperature below which we are certain to find some entanglement. Our witness is then applied to generic bosonic and fermionic many-body systems to derive the corresponding "critical" temperatures that have a very broad validity. © 2009 World Scientific Publishing Company.
Publication status:
Published

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Publisher copy:
10.1142/S1230161209000220

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Atomic & Laser Physics
Role:
Author
Volume:
16
Issue:
2-3
Pages:
287-291
Host title:
OPEN SYSTEMS and INFORMATION DYNAMICS
Publication date:
2009-09-01
DOI:
EISSN:
1793-7191
ISSN:
1230-1612
Source identifiers:
158538
Pubs id:
pubs:158538
UUID:
uuid:41a44219-638d-4762-8f39-6514c1a3cbc1
Local pid:
pubs:158538
Deposit date:
2012-12-19

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